Nitrogen Redox Controls on Greenhouse Gas Production in Yedoma Taliks.

ABSTRACT: Large carbon and nitrogen pools are disproportionately concentrated in the icy, Pleistocene-aged silt deposits of Arctic Yedoma permafrost. Upon thaw, these undergo microbial mineralization, releasing greenhouse gases (GHGs) including carbon dioxide (CO₂), methane (CH₄), and nitrous oxide (N₂O). Here, we present combined geochemical data with microbial function and community dynamics from deep (7-m) talik soil boreholes in water-unsaturated yedoma upland in interior Alaska. Our results reveal significant in situ seasonal shifts in microbial function, community composition, and diversity throughout the talik. Methanogenesis persisted in the deep talik year-round. Winter methanotrophy was negligible within and above the methanogenic zone, leading to elevated

SUBMITTER: Bergman O 

PROVIDER: S-EPMC12277943 | biostudies-literature | 2025 Jul

REPOSITORIES: biostudies-literature